from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, Session
from app.core.config import settings

engine = create_engine(settings.SQLALCHEMY_DATABASE_URI, pool_pre_ping=True)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

def get_db() -> Session:
    """
    获取数据库会话的依赖项
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close() 